Authorities are trying to figure out if he's really American.

The United States is looking to verify the identity of a young boy who claims to be an American in an ISIS propaganda video.

A 10-year-old boy who says his name is Yousef is shown speaking fluent English with what reportedly sounds like an American accent, claiming to be the son of a U.S. soldier, NBC News reported on August 25. Officials have yet to verify the claims made in the video, but are still working to gather information about the child.

In the video, the boy reportedly says he left the U.S. two years ago to live in Syria. "My father's an American soldier who fought the mujahideen in Iraq," he says, NBC reported. "I didn’t know much about Islam except the name. When me and mom came to the Islamic State, we started learning the correct Islamic creed."

"His story doesn't match up with anyone else that we have in our database of American ISIS travelers," Seamus Hughes, a former U.S. intelligence official who helps run the Program on Extremism at George Washington University, told NBC. "It's possible it's a new unknown case, and it's entirely possible ISIS is distorting the truth for the propaganda benefits."

The Daily Beast reports the young boy threatens President Trump in the video, saying "This battle is not gonna end in Raqqa or Mosul. It’s gonna end in your lands.”

The Daily Beast also notes that of the 131 Americans charged in ISIS-related cases, six have military backgrounds. It's unknown, however, how many people with military backgrounds are currently fighting with ISIS abroad. ISIS has also reportedly used American hostages in its propaganda videos.

The U.S. State Department denounced the video in a statement to NBC News.

"We have seen ISIS as they have recruited children, as they have used them as human shields," spokesperson Heather Nauert said. "We have seen ISIS use children the age of some of our own children here as suicide bombers, as homicide bombers. It is sick, it is depraved and it is another example of just how wrong and how evil ISIS is."